This procedure was carried out as described (9 (link)). Briefly, we prepared a single-cell suspension of luciferase-transduced SU-DIPG-XIII-luc neurospheres (pLenti PGK V5-LUC Neo (w623-2); Addgene, plasmid #21471), and injected 105 cells (50,000 cells/μL) into the fourth ventricle/pons of immunocompromised NOD-SCID-gamma (NSG) (strain 005557; The Jackson Laboratory), cold-anesthetized, P3 mouse pups through a 30-gauge burr hole (stereotactic coordinates: 3 mm posterior to the lambda suture and 3 mm deep).